To change the colour of blue litmus paper to red, there must be a presence of acid. Dry HCl gas is not acidic because water is required for the dissociation of HCl into H+ and Cl-. Therefore, dry HCl gas is not acidic and will not change the colour of dry blue litmus paper.
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no dry hcl is also acidic but it acts on litmus paper when it give H+ ions in dissociation with water so it is acidic but it doesn't react without releasing ions
hope it helps u
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